Abnormal vein image restoration method and device

A vein image and repair method technology, which is applied in the field of abnormal vein image repair methods and devices, and can solve the problems of poor removal of abnormal areas of vein images, etc.

Active Publication Date: 2020-12-18
TOP GLORY TECH INC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and device for repairing abnormal vein images to solve the problem of poor removal effect of large abnormal areas of finger vein images

Method used

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  • Abnormal vein image restoration method and device
  • Abnormal vein image restoration method and device
  • Abnormal vein image restoration method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The internal area of ​​a normal finger vein image can be divided into a background area and a vein area. The background area is an area with a high gray value, and the vein area is an area with a low gray value. Both belong to the normal area of ​​the finger vein image. The abnormal finger vein image also contains abnormal areas. The common abnormal areas are that in the process of finger vein image acquisition, foreign objects appearing in the acquisition window or attached to the finger block the light source, or the hardware failure of the acquisition equipment results in abnormal areas in the finger vein image. The regions with low gray values ​​are shown in the The blood in the veins of fingers only has a strong absorption of near-infrared light, and the light source of the collection equipment also has natural light in addition to near-infrared light, so the gray value of the vein area is relatively low, and after foreign objects block the light source, due to The...

Embodiment 2

[0126] Refer to attached Figure 7 As shown, the present invention also relates to a device for repairing abnormal vein images, which includes:

[0127] 1) Abnormal area screening and processing module, which divides the finger vein image into several segments according to the gradient in the horizontal and vertical directions, and according to the starting point, ending point, average gray value of each segment and the corresponding entire row Or the difference of the gray value of the whole column judges the abnormal area, and expands the abnormal area; the abnormal area screening and processing module is used to realize the function of step 1) of embodiment 1.

[0128] 2) The direction filtering module, which performs direction filtering to determine the direction information of each point in the normal area for the normal area except the abnormal area; the direction filtering template is used to realize the function of step 2) of the first embodiment.

[0129] 3) The best...

experiment example

[0133] The effectiveness of the method for repairing abnormal veins involved in the present invention is verified by comparing the recognition rates before and after repairing the abnormal image database.

[0134] First, a normal image / finger is collected as a registration image, and a total of 500 fingers are collected. Then collect the abnormal images of these 500 fingers. The method is to stick a small piece of paper on the finger of the person to be collected during the collection, and collect 10 abnormal images for each finger as a verification image. For comparison, the simulation and recognition rate comparisons are also made with the commonly used image denoising algorithms median filter and mean filter.

[0135]The comparison adopts a 1:N comparison method, that is, 1:500, and there are a total of 5,000 comparison results, which are divided into a comparison success rate test and a comparison recognition false rate test. The comparison success rate test is that when ...

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Abstract

The invention relates to an abnormal vein image restoration method and device, and the method comprises the following steps: 1), dividing a finger vein image into a plurality of segments according tothe gradients in a horizontal direction and a vertical direction, judging an abnormal region, and enlarging the abnormal region; 2) for normal areas except the abnormal area, carrying out direction filtering to determine direction information of each point in the normal areas; 3) selecting a direction neighborhood template with the highest matching degree with the to-be-repaired point; and 4) solving the repaired gray value of the current to-be-repaired point, repairing the to-be-repaired point according to the repaired gray value, marking the repaired point as the point of the normal area, and returning to the step 3) to traverse the to-be-repaired point in the whole abnormal area until all the to-be-repaired points are repaired. According to the technical scheme provided by the invention, the restoration of the whole image is completed, and the defect of poor removal effect on a large abnormal region in the prior art is overcome.

Description

technical field [0001] The invention belongs to the technical field of biological feature recognition in information security, and in particular relates to a method and device for repairing abnormal vein images. Background technique [0002] With the development of the times and the maturity of technology, finger vein recognition technology has been applied in many scenarios, such as smart door locks, safes, gate passages and access control. With the expansion of the application scope, the current finger vein recognition algorithm is facing more and more challenges, and the abnormal finger vein images have always had the problem of low success rate of comparison. Affected by the current technology of finger vein collection equipment and complex application scenarios, there is a certain probability that abnormal finger vein images will appear. An abnormal finger vein image means that there are large abnormal areas in the image, resulting in less information available in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/00G06T7/11
CPCG06T5/002G06T5/005G06T7/0012G06T2207/20032G06T2207/30101G06T7/11
Inventor 赵国栋蓝师伟张烜李学双
Owner TOP GLORY TECH INC CO LTD
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